The present application discloses a method, system and related device of implementing vehicle automatic payment. The method includes: controlling, by a vehicle controller, a vehicle to drive automatically and stop at a payment position; obtaining, by a payment terminal, vehicle identification information of the vehicle, and determining payment amount corresponding to the vehicle identification information; sending, by the payment terminal, leaving indication information to the vehicle controller after determining that the vehicle controller pays the payment amount; and controlling, by the vehicle controller, the vehicle to start and leave the payment position when receiving the leaving indication information.